sound/soc/rockchip/rk_hdmi_i2s.c

   1 /*
   2  * rk_hdmi_i2s.c  --  HDMI i2s audio for rockchip
   3  *
   4  * Copyright 2013 Rockship
   5  * Author: chenjq <chenjq@rock-chips.com>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/device.h>
  10 #include <linux/of.h>
  11 #include <linux/of_gpio.h>
  12 #include <sound/core.h>
  13 #include <sound/pcm.h>
  14 #include <sound/soc.h>
  15 #include <sound/soc-dapm.h>
  16
  17 #include "card_info.h"
  18 #include "rk_pcm.h"
  19 #include "rk_i2s.h"
  20
  21 #if 0
  22 #define DBG(x...) printk(KERN_INFO "rk_hdmi_i2s:"x)
  23 #else
  24 #define DBG(x...) do { } while (0)
  25 #endif
  26
  27 static int hdmi_i2s_hifi_hw_params(struct snd_pcm_substream *substream,
  28         struct snd_pcm_hw_params *params)
  29 {
  30         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  31         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  32         unsigned int pll_out = 0;
  33         int ret;
  34
  35         DBG("Enter::%s----%d\n",__FUNCTION__,__LINE__);
  36
  37         switch(params_rate(params)) {
  38                 case 8000:
  39                 case 16000:
  40                 case 24000:
  41                 case 32000:
  42                 case 48000:
  43                         pll_out = 12288000;
  44                         break;
  45                 case 11025:
  46                 case 22050:
  47                 case 44100:
  48                         pll_out = 11289600;
  49                         break;
  50                 default:
  51                         printk("Enter:%s, %d, Error rate=%d\n", __FUNCTION__, __LINE__, params_rate(params));
  52                         return -EINVAL;
  53                         break;
  54         }
  55
  56         DBG("Enter:%s, %d, rate=%d\n", __FUNCTION__, __LINE__, params_rate(params));
  57
  58         snd_soc_dai_set_sysclk(cpu_dai, 0, pll_out, 0);
  59         snd_soc_dai_set_clkdiv(cpu_dai, ROCKCHIP_DIV_BCLK, (pll_out/4)/params_rate(params)-1);
  60         snd_soc_dai_set_clkdiv(cpu_dai, ROCKCHIP_DIV_MCLK, 3);
  61
  62         DBG("Enter:%s, %d, pll_out/4/params_rate(params) = %d \n", __FUNCTION__, __LINE__, (pll_out/4)/params_rate(params));
  63
  64         return 0;
  65 }
  66
  67
  68
  69 static struct snd_soc_ops hdmi_i2s_hifi_ops = {
  70         .hw_params = hdmi_i2s_hifi_hw_params,
  71 };
  72
  73 static struct snd_soc_dai_link hdmi_i2s_dai = {
  74         .name = "HDMI I2S",
  75         .stream_name = "HDMI PCM",
  76         .codec_dai_name = "rk-hdmi-i2s-hifi",
  77         .ops = &hdmi_i2s_hifi_ops,
  78 };
  79
  80 static struct snd_soc_card rockchip_hdmi_i2s_snd_card = {
  81         .name = "RK-HDMI-I2S",
  82         .dai_link = &hdmi_i2s_dai,
  83         .num_links = 1,
  84 };
  85
  86 static int rockchip_hdmi_i2s_audio_probe(struct platform_device *pdev)
  87 {
  88         int ret;
  89         struct snd_soc_card *card = &rockchip_hdmi_i2s_snd_card;
  90
  91         card->dev = &pdev->dev;
  92
  93         ret = rockchip_of_get_sound_card_info(card);
  94         if (ret) {
  95                 printk("%s() get sound card info failed:%d\n", __FUNCTION__, ret);
  96                 return ret;
  97         }
  98
  99         ret = snd_soc_register_card(card);
 100         if (ret)
 101                 printk("%s() register card failed:%d\n", __FUNCTION__, ret);
 102
 103         return ret;
 104 }
 105
 106 static int rockchip_hdmi_i2s_audio_remove(struct platform_device *pdev)
 107 {
 108         struct snd_soc_card *card = platform_get_drvdata(pdev);
 109
 110         snd_soc_unregister_card(card);
 111
 112         return 0;
 113 }
 114
 115 #ifdef CONFIG_OF
 116 static const struct of_device_id rockchip_hdmi_i2s_of_match[] = {
 117         { .compatible = "rockchip-hdmi-i2s", },
 118         {},
 119 };
 120 MODULE_DEVICE_TABLE(of, rockchip_hdmi_i2s_of_match);
 121 #endif /* CONFIG_OF */
 122
 123 static struct platform_driver rockchip_hdmi_i2s_audio_driver = {
 124         .driver         = {
 125                 .name   = "rockchip-hdmi-i2s",
 126                 .owner  = THIS_MODULE,
 127                 .of_match_table = of_match_ptr(rockchip_hdmi_i2s_of_match),
 128         },
 129         .probe          = rockchip_hdmi_i2s_audio_probe,
 130         .remove         = rockchip_hdmi_i2s_audio_remove,
 131 };
 132
 133 module_platform_driver(rockchip_hdmi_i2s_audio_driver);
 134
 135 /* Module information */
 136 MODULE_AUTHOR("rockchip");
 137 MODULE_DESCRIPTION("ROCKCHIP hdmi i2s ASoC Interface");
 138 MODULE_LICENSE("GPL");